(19)
(11) EP 0 459 246 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.03.1992 Bulletin 1992/11

(43) Date of publication A2:
04.12.1991 Bulletin 1991/49

(21) Application number: 91108014.1

(22) Date of filing: 17.05.1991
(51) International Patent Classification (IPC)5: G11C 7/00, G11C 19/28, G11C 16/04, G11C 29/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 01.06.1990 US 532065

(71) Applicant: NATIONAL SEMICONDUCTOR CORPORATION
Santa Clara California 95051-8090 (US)

(72) Inventor:
  • Hall, Christopher M.
    Redwood City, CA 94062 (US)

(74) Representative: Sparing Röhl Henseler Patentanwälte 
Postfach 14 04 43
40074 Düsseldorf
40074 Düsseldorf (DE)


(56) References cited: : 
   
       


    (54) EPROM register


    (57) An EPROM register is programmed in a manner substantially similar to the manner used to program a main EPROM array contained on the same integrated circuit. However, reading information from the EPROM register and the main EPROM array is accomplished differently. To use the data in the main EPROM array, it must be read out by applying appropriate address and output enable signals. Only during that read cycle is the data from a particular addressed location within the main EPROM array available on the data bus. In addition to the main EPROM array, an EPROM register is utilized which allows the data stored in the EPROM register to be available at all times.






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